A primary charged particle [1]} is defined as a charged particle with a mean proper lifetime \(\tau \)  larger than \({1~\textrm {cm}/c}\) , which is either produced directly in the interaction or from decays of particles with \(\tau \)  smaller than \({1~\textrm {cm}/c}\) , excluding particles produced in interactions with the detector material.
Charged-particle trajectories are reconstructed using both the ITS and TPC detectors.
In order to select only tracks with good \(p_{\mathrm {T}}\)  resolution for analysis, a minimal length in the active detector volume as well as a good agreement of the final track parameterisation with its comprising space points are required.
The contamination of the track sample with weakly decaying particles, secondary particles from interactions of primary particles with the detector material and from pileup events is significantly reduced by selecting only tracks originating from a location close to the primary interaction vertex.
In previous ALICE publications [2]}, [3]} those selection criteria were studied in great detail and optimised for best track quality and minimal contamination from secondary particles.
